CVE-2014-1776 — Microsoft Internet Explorer Memory Corruption Vulnerability

Use-after-free vulnerability in Microsoft Internet Explorer 6 through 11 allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via vectors related to the CMarkup::IsConnectedToPrimaryMarkup function, as exploited in the wild in April 2

01What is this vulnerability?

Use-after-free vulnerability in Microsoft Internet Explorer 6 through 11 allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via vectors related to the CMarkup::IsConnectedToPrimaryMarkup function, as exploited in the wild in April 2014. NOTE: this issue originally emphasized VGX.DLL, but Microsoft clarified that "VGX.DLL does not contain the…

02Affected products

Vendor	Product	Versions
n	a / n/a	n/a

03Active exploitation status

Yes — actively exploited. Added to the CISA KEV catalog on 2022-01-28. Ransomware use: Unknown.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Open the Sigma generator with a pre-filled prompt for this CVE to draft a starting detection in your stack of choice:

Open in Sigma generator →

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2014-04-27T10:00:00.000Z
• Last modified: 2025-10-22T00:05:37.934Z
• Added to CISA KEV: 2022-01-28
• BOD 22-01 due: 2022-07-28

09References

• securitytracker.com — http://securitytracker.com/id?1030154
• www.osvdb.org — http://www.osvdb.org/106311
• docs.microsoft.com — https://docs.microsoft.com/en-us/security-updates/securitybulletins/2014/ms14-02…
• blogs.technet.com — http://blogs.technet.com/b/srd/archive/2014/04/30/protection-strategies-for-the-…
• secunia.com — http://secunia.com/advisories/57908
• www.signalsec.com — http://www.signalsec.com/cve-2014-1776-ie-0day-analysis/
• www.fireeye.com — http://www.fireeye.com/blog/uncategorized/2014/04/new-zero-day-exploit-targeting…
• www.kb.cert.org — http://www.kb.cert.org/vuls/id/222929
• technet.microsoft.com — https://technet.microsoft.com/library/security/2963983
• www.securityfocus.com — http://www.securityfocus.com/bid/67075